fix: XP not increase for out of app add exercise

app/Http/Controllers/BreathingExerciseController.php

@@ -26,7 +26,9 @@ public function store(Request $request)
         ]);
 
         // Give XP (e.g., +10 per session)
+        if ($data['created_at'] == null) {
             $user->increment('xp', 10);
+        }
 
         return response()->json([
             'message' => 'Exercise saved',